The final turbine was installed at the end of March 2015. The 35 turbines are located eight kilometres off the UK's north east coast, near Hull.
It is the first commercial project to use Siemens' SWT-6MW-154 turbine. Vessels firm GeoSea completed the installation of foundations at the site in May 2014. Seaway Heavy Lifting installed the project's substation in June 2014.
In February, Dong contracted US-based SmartWind Technologies to deliver a "dual-doppler" radar system to its project.
SmartWind Technology's dual-radar system can map wind flow around wind turbines. The radars will be able to give a high-resolution map of wind flow through the project.
It will be installed at the site in 2016 and gather data for 18-months. Dong said the program will be the first time radar has been used to measure offshore wind.
Recently, the project was named as part of an ongoing lawsuit between Siemens and Enercon. Enercon owner the Wobben Foundation claims that Siemens' High Wind Ride Through (HWRT) technology infringes its European patent.
The technology is designed to allow turbines to operate at higher wind speeds.
Westermost Rough is jointly-owned by Dong (50%), the Green Investment Bank (25%) and the Marubeni Corporation (25%).